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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04e8c391eb5acdc69bf2d2fc248383167fcd107aa2f5a09ade7e592971feb85' 
  AND token = 'Add5vCdMVibxvEeG47YMQUas4l9lxftxY23IXmiNDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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