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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ab24484e84d8e18bacb8e8e97a134b54c7f2f53eaf5495dee36b0c1aeda4a4' 
  AND token = 'CTPN9xOeIKxFQ4xkOVgT2gFUQoM6tiWzzjiIZszMvL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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