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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6a4c041d517fbeb2b16675db41cc6a0a1febfad28c1db3fea79edad86e14fb' 
  AND token = 'E1xMzkrRknC2zni6PoI8LQXraYNBDEdZQEWY3ETsv84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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