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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5d460b5d9585c6593a1e31c2497b8c6ac78e18c508b42e117c2691bc4ce1a1' 
  AND token = '/wCAg0bCZ4fJ91K5UdyUCu9LZc1BraC+/7keRQpcgXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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