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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb17cf452588d911423de0389d54762b9c48d8ced440d4a256537e9657deaff' 
  AND token = 'SwTJkn6S0PTwPVBXQOLvg9uETb0a52Di7MtQq2Zu2RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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