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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eae0f368febcc55336325c2b3a0c003204f10423498512be2375d17c84c5646' 
  AND token = 'G/C1qMxSBbJqCf/gyh7iTcQ7QXj3RquqDRFRKWuNMnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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