SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed132a6e362485c3151cb3ed9171a48dbcd7e54dbf8b3366db96648e04f0b5d2' 
  AND token = 'u5Sws/jGj3/bUrsaT4xjg4N+mZu2CUNjTR0pzGkHKhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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