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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04c29218e6ef68784813235bd7edff815d86767aed9a74c2dcd5266b63fcaf8' 
  AND token = 'qT5XtoYjcUiUzUhD3SLlKE/0pEuF4SHdLZ/Tqy7dNao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}