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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae977bd27fc66ecac24b35d9ec565ae83533e08da6cf93c584a3308bb0b7666' 
  AND token = '3t4hoYLDO8Oq6e4EFp7RC5nHAkH3v4r7W1tZEFu/JpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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