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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9f0a360f4610fc47fafa28a737837b7d553000f16e96a68f422c588b218aa8' 
  AND token = '+N+RNVxgVen2NrxngQVXN6V1bcRQjenZY/VtnI593UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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