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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eecc1ba2e9510a1e3a5ddd5a66b8f55bd93113a86dc601d454102b5ef070e9' 
  AND token = 'WLs8FOajIsSEPZB3UxD5hsX+z4cAdPPuDbRvbQFfrnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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