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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044d23dbbbc86f46dd72bf5587cd4a026be8eea9a984d1629ecbe9ab2184ed7' 
  AND token = 'EUOLzWnv2zZOL3P4DpGv4U7kcMTpf0c0ZdxuRLaXWB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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