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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32833879d9cd6e3c511d1fe75b2cdf9e258b43d9cd36daa3ed3409f4ff81ff03' 
  AND token = '+UaNkkrJi+iBcyEXpdiRlKttwgO2Kv4rBbH4cEM6WkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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