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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a930d262bd4a5cdcee66e236fd4b0971dfd08e53eeb1a52d6e67cb4af3cd7bc6' 
  AND token = 'I5yk55kkPjZXNf7pqRr5sWDwyDkY4ugguRUZoEVJoPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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