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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed4d84c9f823b35e865acb1deaa36d376cdf0a310dbbc01343cccd5e493dc6e' 
  AND token = 'cc71Hyiw6I0MqYGFqQBX5V0Ubs+SEV8/tiQeZ+sVlhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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