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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f06bbfd71c90f24ddb6bc7b51efef41a81d9b72dbacbbfbab8a26b45719bd39' 
  AND token = 'CG9+4K/9gtwe9HT8Vwu9EZJY2E7MFZOZsMhqci/Nlgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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