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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e38d8d9c553b6d4423d65a4a013137af42eb96a6d59eed3af0bdf2231ac1f3a' 
  AND token = 'uA6K+pp+bEDafcHJtRNEfj9wNs8QnwLAR2YS48Kz9iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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