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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac326e326f4a8f83d7f7ed7a4032df89e4bdc9cc285e0f2cc1ea170ef8ccd15' 
  AND token = 'Y0moR7MOUt0eeDs1LqvR6ngqLlnAka3Z2p8EyMhbBI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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