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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d8d2ba32b4b2103d2ed56762ab8f8c7473a16b92b027f5db79b9d000bf1838' 
  AND token = '90EY1yIK+zC60QCDpkgrPaASr2C10Cat73g2LWDl6HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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