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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd769bde775990ce7f86642a48b6d4232cb2ff67332bf6268c960b9d65ccf50' 
  AND token = '1eEtMusLtP88ubISYeklp8nWDUv0Kv7ZFjbc+bmwUUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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