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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ee8bb72bf7768c0374ae018f31713eb1f25fbb6c581b1d3834df1800407cd3' 
  AND token = 'ZeK3tc/9dbxiB/jtiS9PSkKnRLxt6M6NHEhvIuY7ozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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