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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d4c9d57fabbca83c13414547e0f582b55e433c83f6ab3cc68a36bcfd80ec27' 
  AND token = '9cL759L50JTuziHff8Rmx2QI/jDyDU45X5LEHJ2MynY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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