SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01eaf199385f5c8c600c81712f81a77f0c36a84352f5bf31bfee74f74ea0714e' 
  AND token = 'XcGgZkgjnjhQJX6VLHFnHBI1Nz/W55LRiKFFT41wDw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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