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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097a16d153b305d00f540f365d21116f0bf5b9c8f24854255d03cf657224882a' 
  AND token = 'ys5Uvz9/BCQuwGNC96qXMpqtv2B62Q6XqyjlhbbDqdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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