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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c4c26aca6ed02a4f6db973f573695ba595298e934fb5da5042eb0bbe06692c' 
  AND token = 'LXT8H0aoGO/A7TW+zl7mTzM6OROKmEv/8wuX4sJl3rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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