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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d8f924b56e495a6b7cdf5fb404da0684ea59afe8f0912536c05796f4f08f35' 
  AND token = '6KS2/4F338rINiOCtOOqZMjXM4QYfAaPhH4tnDlkL5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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