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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003e73d6ef7341c419b0bd280e0b6f24eacbca9d985c477b34c5393ff71eee53' 
  AND token = 'Ckh4z9fD5AYFfbFGSOJB617sTNieiDpEHTg6JXL7jGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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