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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae008f7f061959bff57c9c44770efc747866890fb57d5dde959e9e1efaf1cb6b' 
  AND token = 'YGn9i8NhpdV0V4wMJ4YjjXD1jjoaoqyoH/zvd8DAjjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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