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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5684c0ba3391fff6fa856a1ddec5ee3753910c096ec8bbd5e17a63956e04468' 
  AND token = 'ABk5E7Q/cWMyHml/Aa4MTaeLhxd9QBT+i4CU+fWNyog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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