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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dbe3b5c7165560051202d1c3470206693a29faec3b70a11f9529a278e93ea1' 
  AND token = 'ZRtsax8gkQ5z6qzHEtXPSZgHkJq5Xjy1xIw7Hjka9oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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