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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c363cad75b0e8cd47ac5687b390674af8abec3c165f5c7ab644dec728ecb2390' 
  AND token = 'EmSKSLa4QhiicBY2VUMnYRzZGYjW5WhWpLt7b0GPM94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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