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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eb6e2c178b349903704f14e8fb1a2b8c3a2efb2ec1008f6962855bfdd3b8a2' 
  AND token = '3swOrMCuhWsFp2Ku+zfsRkLMAvj2HhVorMi3owvKvRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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