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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7636cd4dc9dd3d045637feed17028b4334142ec59dbe351617fcb11d2a94cc' 
  AND token = 'Xv2PLHhrnxMnZjT7T4lLmC3eRosrp7qE0pgIkFCs3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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