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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6e3fcabf3c3657358d1602fb757d7239e2a4ebdca0461c69ff6a7dbfd9e72c' 
  AND token = 'TgQ73mAkIMNWTxSC22uYkvhb/Bg+zefIypZ5e1VGFv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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