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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37404a3d59addfb553199b753bc173fab24df07092ed7280526ee5ba44c795a3' 
  AND token = 'zbj9xf9EE60EnCse+5D/cic1Yt/+9400JVuYM5UmSV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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