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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3616e882950b6cc7491ed52311bca5a8d0ff6d3cb1577bcf61148d30179842c' 
  AND token = '6RxBTJjmIz3EFbJ4hFwMgQXFynun8TynwpKnd0DIqbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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