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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0279f5891f4c3222326cd73988f4bd02e63cdd05cf8a3b7fc8837a23f1dca40e' 
  AND token = 'LEAscR1oxYK2O0nJLg8swrW7EAPVDMBZQSBqalD7ziY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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