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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4a1a61b47b6b943c20dbf8af1e00f0ff0c2dc17a28d5f12c0a007638de1f83' 
  AND token = 'TkQiHBxXhZNzo4d35M0Kd1pnNLW/d1cla1sYYiBBf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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