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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17876f917b18e08ece05d8acf98987c0f73c2f6b883fd16c1abac8025034e6b' 
  AND token = 'Sw9NAJ6/ZsK6KcP/8V7guQDJd1GgU4hUYv6l9c9WGGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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