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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd7b31ce4dcddbe2fdcb92b141d46128cc955c4989086220b8ce6ad35169d8d' 
  AND token = 'jizdGu7pswLGFACGeZOlhP5WSDLI2EWE9NHSJVfNu+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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