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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175a82b0528b4b1b3163d03912dd7adb6389ab40c9b690bf9f1e694fdfd320d6' 
  AND token = 'kyrY6sGCLH3YDFoMM9TB+Z15Rdbqlm2u7IWPo9Ntgp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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