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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599201cb5e08af80be91ac60a83211b560be152819f555e662717e342fb086bf' 
  AND token = 'HP1Uc1H94r2QRP6WsFceJaIuXT/koPc+AV6eNba+4wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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