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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f89883f4dfb647528caa5ea99e31b891a23d21beae3109098aa69660dd6f07' 
  AND token = '4l6ETVFlsCZqXwu9BIf7+ChD4WL5L8SOJBcJdJFFoIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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