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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ee0896a859e63e3eeff5ce16c2c5d5607eb590edb55742e2013f97c208bd17' 
  AND token = 'kxbdIMZQLZ14rQ/oR3Wjg0JUmJaEY93gGPqzDsjMwMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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