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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f5c32bd2c2c2ad5b7a16dd488b73fa5f2784ddb3e5cc27f854b58fc910b95c' 
  AND token = 'tL6xC8rPtMU3WEkIAT4nSM84He7YTMd1K8mYgP3hfkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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