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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9559c45b91f94c3d7852009df8a5378ffa0fc5440a660c022c85a5ed0ed7166' 
  AND token = '7xfHlKsBlvXWm//CLyaQHmx7qwBSUi3e2XMdC8WYv2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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