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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a40c38ae21617c1ead768b08d200d5118567621a23899b1ea19bb7e56184ef0' 
  AND token = 'dhVy17QASH70qIZO5oVDnDM6nmSZ0nAg6oX2ZwqK8XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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