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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbede7a72cf06f75ce843e522b48f9c4911c9a5571a6a5b432a9903a04a67aea' 
  AND token = 'jweRaDnEjyY3DIw0XGN/yC9weTfO6CGriGm4FBkDj/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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