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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6157e468cbe86a50d8436926a85525afe52a2217720afda6a1320d2fc477a99' 
  AND token = 'oJ8nf9OqwXM/WtoYbSgcoQpAxLtuxW5PXRFHlHqZDWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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