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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3c32387ae2c700428330533067e98b2689a926d39accb6de55d7d3970ce408' 
  AND token = 'WHULt6EEOZ/ruKeq7RAAAjKFXC5WYoz4ma6FTMshqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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