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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e572a6b8067c222cfa3abe464c8a42503262056b3e925afd6493ca612a56d2' 
  AND token = 'fMH9H3KXT6nsJbaQ6GKbgzLXMQjZv0Awy8Aqj+YQeTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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