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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dfd9a92de804b58dcde9cf38b2fffc2fcc06be96d5383c6c57db8485fb1bf2' 
  AND token = 'S5dBXRUxLW8sa5qc+bZL8Q9MuNQEIuM7dge4qWNQhjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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