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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61fe0b9aa8c101ed302533f2c49a43ef9d234584f6aec63108a9b7005730f4e' 
  AND token = 'rEwXU1YkcnjmNkXg5ygrm10IX+g8aNAMevk54fiID+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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