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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512263e301d23c42a5b5ec1bbfeb4bb47ebe54aab910e5244090fe6ca720352f' 
  AND token = 'AkFiQRXUkme6qZHzypGnB4XWLcQrs9cQ39yIJr8cG1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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