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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff514c2680abadad493a88a2c88975516ca54509b6af406ecd482b7da8c6388' 
  AND token = 'IJt/YlZr88PYZNyM4CqKTLmqeMbSLLh9g7HFXzN4AK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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