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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3fca3303068ac63f38a6174bd71c7cc9b29db50863cc5ce5526fdb1ad66466' 
  AND token = 'aG5zES5c8lyR05vp9JlSMqEw7DdTU+FDpv6B0Z98yqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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