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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c5b184c8b80623b6f2391de05861a047199d9e454e51dc0fb9d9b5cae714dc' 
  AND token = '/Qj8mc/t0NsIp1bngIdiA9xQ9jxsloBQnl1dNC6H5pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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