SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01be3a4e62678e0c64dea77fd94e46219fa83c1d680521cd66d09b7951bc0a9' 
  AND token = '2W/hMqPj/GHQzqCH4NPBB2phg6A1n4SUwzNzeXCNJus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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