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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52a6e53196930692067cce03ca5d5019d8f6ae87a3dc0eac71fffbb4eeb4274' 
  AND token = 'w7JWeJ08quWsHn/yJRS1qGkSiU+Stn4AhAXZHmJUCCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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