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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ddad6d3638d947c453d4d656c44406c44a573d852eba854231d082217afba5' 
  AND token = '+5RMNZcGLKx7F6P1Jgp6iFzYH2s39v0Z02I8CLoi5QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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