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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068644c9a0b125c2fbc1984bfa49d7d10424d08b628f44e9c6b3a1434ad397e5' 
  AND token = 'e3i4tgF5rJmJSJmx0SWs+ZvPVXd5RDfs6QTW68syEQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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