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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008a54368520353edad028a5d9ac09b776e81fd11d70fedd02420f55e61003a0' 
  AND token = 'PnVgv+sa6z5W7Z4buKRYMHvaT6lcIuh812LGRBZVIYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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