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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418312d19ce3f1a6b4a30d851df9bc44578ca3b47b9a43dfef8992707dfafe8e' 
  AND token = '4WI8DrQpQZLQ75xXp7MDdfmU+F+Ty3l91M1PZ4npfes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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