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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba6ca17b5a404a66ba16984fedf908905a5ff0ef2db562030921b12e447fa3d' 
  AND token = '3/ffJ+HqkobgvLGyau5le7cFPRjuLZh8+AfQMshi7T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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