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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f84696486e8022cb7b45e95a75913e2d94883e11ed654f3b7767e7321dde952' 
  AND token = 'm1dpbgw1ztUMp2PI15tTCuNIQZzMP3C+uVv0C3Hl+zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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