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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7238be00ab4009cec2eef2e8b4cd14182d00f3e242b644d462ea06bbd9f1d8c2' 
  AND token = 'A4/TOuorHjB+xYMSwOeAPckS0wSICiE7WmD3OEmutrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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