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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2890a5233edffdc24346b44303a1dd46ba10ec633577fa81def448a46f7cbb46' 
  AND token = 'kWltce51Qd7UAZKIIGHi/ut95hQSvMGOIG4yoD7tMcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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