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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c721b9eb11017bf6e1c72446f3394e7831805d3648fb01bf9f1d12edebb772' 
  AND token = 'XdWc4/Q35JycGPa/MqS7dyPnMzGu5bR6WuUdCqTlYK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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