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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45249d981826fcd70314f723550a9ef802143c32b877e0bcd5e83a9bbe8d52b2' 
  AND token = 'QU6nP/25UVLJSPgC8ZC5V88cNCQfkkQ5enpHlasTGP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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