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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba9778c913537297885aa21ec44d036ade016fc7872f6832b2f41eceb679e44' 
  AND token = 'FcVxq67SlyaC6JCB6rH2dy5Ky0v/u/IwReeAkSRkOCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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