SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9e329518188728ac7b2933f09ef09abb15412b6ac8eb8b51b24a7659841d7c' 
  AND token = 'JWEp2V6PogwRkdt+JgcWykLfmc/YPhN9FK7sgswmh/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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