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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed850a86db63389e969cc2a5da4c344472bb1defc20a9a19bbc2d302eb78488b' 
  AND token = 'Ulv3/Afv7L+uVUaaMoijtrbOHQU1A2L+gLqvOKVxTks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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