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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8b077d62c72aea63c57fca1368e76e2381241b7f4b9f8f4b9fc8f8ca7dd5df' 
  AND token = 'eOPv1K4iRlUUsmPe29D3lqnW38YalHXOeF4KLFXUXdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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