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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96591723b6ec0a4c83d20c71924a6256a12238b5e5e7504533ff45c25cd3d08e' 
  AND token = '7oiNNZWbECipLpWL5+30XQhXJtw05DPY7qzH5NKWQtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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