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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fc96e5ecd3cfdb0b8516e1702a92683c37ae60c3503ced6cf9614c381d9888' 
  AND token = 'MZDp5XPY5R2Jou8/K7Etsv4x4BLATZ1XhIpw8y5DmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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