SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ec3543ec5c869c0075a9e842d4315a40fdc473f367aa89f2995425032c1e5a' 
  AND token = 'PC/lzwvQ4yTXKvih0kQzLF6+enGXABvOCGeK4iMFbtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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