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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a03a1dbe96183de7f465e852c750ad31263a21b28666219ae9e480788d6d001' 
  AND token = '7nGZ9JQrZK+aO/7GeYSZC12h2qFdZQoy9/IS8giAJRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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