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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8531a223f762c5dd0b9ed8ca76bb75a688688021e773305c375b622699f3a56e' 
  AND token = 'AzjbYNHVbi1cThTQaI9uxgne7yLohqRGcQ9Yc+d7q0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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